My mare absolutely adores her salt. I keep a Himalayan salt lick in her stall. Recently her foal (today 10 days old) has started licking it. I wasn't worried but someone at the barn said they had heard of a foal dying from licking a salt lick?
My colt had mild diarrhea that would not go away despite treatment a few years ago. We finally caught him craning his neck and standing on his tippy toes to reach the himalayan salt lick that I would have sworn was way too high up for him to reach. Took it out and his manure was normal within hours.